The asian and Japanese market will garuntee at least 2m this year with more Swords Arts, Persona, God Eater, One Piece, Digimon, Star Ocean 2 remake, Saga, Toukiden next etc all coming this year.
Nope, it wont get close to 2mil. In japan the sales were both 1.1mil in 2013+2014, the games you mentioned wont push vita passed 1mil this year (Saga+Digimon are the only real system sellers i see as of now) in japan. 2013 had Price Cut with huge games (for the system) and 2014 started really strong, but fell apart during Q4.
Vita will do 700k-900k this year (japan). PS4 will hurt sales overall especially with all the big games coming in for it. As for the games you mentioned...
SAO: Already had one
Persona: Just a dancing game
GE: Ok this will give a nice boost but nothing compared to GE first release which had vita tv launch+holiday boost beside it.
One Piece: Its on PS4/PS3
Digimon: Could push the system, but im not that confident (i just hope the game does well tbh)
Star Ocean: No Comment
Saga: This will push systems, guaranteed
Toukiden: Already had 2 games released.